I have had good success w/ powervar units, but they have thier limitations and should only be used if you have a real issue. They will clean up the power supply nicely but they also will limit performance, slightly at the upper extreme and in terms of overall power of your amps.
When I lived in an Apt style condo, I decided that I was better off with those negitives because they provided a clear and transparent soundfield with the cleaning aspect.
Use one for amps, and another for digital gear. Place them on an east-west axis (don't know why, but that eliminates an occasional tendency for them to hum. And make sure that thier amp output is suffient for the gear you will plug into it. The audio designed gear is better but of course much more expensive. For the money, they can be well worth it.
When I lived in an Apt style condo, I decided that I was better off with those negitives because they provided a clear and transparent soundfield with the cleaning aspect.
Use one for amps, and another for digital gear. Place them on an east-west axis (don't know why, but that eliminates an occasional tendency for them to hum. And make sure that thier amp output is suffient for the gear you will plug into it. The audio designed gear is better but of course much more expensive. For the money, they can be well worth it.